<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

  <div id="app">
    {{msg}}==={{n}}
    <h1>{{title}}</h1>
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.min.js"></script>
<script>
    const vu=new Vue({
      el:"#app",
      data:{
        msg:'hello vue',
        n:111,
        title:'插值表达式'

      }
  })
  console.log(vu.title)//取数据
  console.log(vu.title='插值表达式111')//改数据

</script>


  
  
</body>
</html>